CN110823390A - Temperature sensor - Google Patents
Temperature sensor Download PDFInfo
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- CN110823390A CN110823390A CN201910734756.1A CN201910734756A CN110823390A CN 110823390 A CN110823390 A CN 110823390A CN 201910734756 A CN201910734756 A CN 201910734756A CN 110823390 A CN110823390 A CN 110823390A
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- sheath
- temperature sensor
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- end side
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
- G01K7/04—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples the object to be measured not forming one of the thermoelectric materials
- G01K7/06—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples the object to be measured not forming one of the thermoelectric materials the thermoelectric materials being arranged one within the other with the junction at one end exposed to the object, e.g. sheathed type
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
- G01K1/12—Protective devices, e.g. casings for preventing damage due to heat overloading
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
- G01K7/10—Arrangements for compensating for auxiliary variables, e.g. length of lead
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention provides a temperature sensor, which can reliably insulate a connection part between a lead wire and a wiring from a temperature sensing element and a temperature measuring contact even under high temperature in the temperature sensor. A temperature sensor (1) is provided with: a temperature sensing element (90); a sheath member (20) which is disposed on the rear end side of the temperature sensing element and has a pair of sheath wires (21) connected to the temperature sensing element and a sheath outer tube (22) in which the sheath wires are made of an insulating material; and a pair of leads (80) disposed on the rear end side of the sheath member and connected directly or indirectly to the sheath wires exposed at positions closer to the rear end side than the sheath outer tube, wherein the temperature sensor further comprises an insulating cover portion (25) formed of a glass braid and individually covering a pair of connection portions (23) between the sheath wires and the leads at positions closer to the rear end side than the sheath outer tube so as to insulate the connection portions from each other.
Description
Technical Field
The present invention relates to a temperature sensor including a temperature sensing element such as a thermistor element or a Pt resistor element, or a temperature measuring contact formed by joining the tips of a pair of thermocouple wires.
Background
As a temperature sensor for detecting the temperature of exhaust gas or the like of an automobile or the like, there is known a temperature sensor using a change in the temperature of the resistance of a temperature sensing element such as a thermistor or a Pt resistor, and a thermoelectromotive force of a temperature measuring contact of a thermocouple.
As a temperature sensor using, for example, a thermistor, there is known one having: a pair of (sheath) core wires are connected to the rear end side of the thermistor, the core wires are held in an insulating material (sheath tube) in an insulating manner, and a pair of lead wires are connected to the rear end side of the core wires (see patent document 1).
The thermistor, the core wire including the insulating material, and the lead wire are accommodated in the metal tube. The lead wire is drawn out to the rear end side of the temperature sensor and connected to a connector portion connected to an external device via an electric wire.
For example, the following structure is known: a pair of sheath pin core wires (a pair of シースピン core wires) are connected to the rear end side of the sensor portion (thermistor), and the connection portion between the sheath pin core wires and the lead wire is held by a molded portion formed by solidifying a ceramic material (see patent document 2).
For example, the following structure is known: the temperature sensor includes a pair of signal lines extending from a temperature sensing element (thermistor) toward a rear end side and a pair of lead wires connected to the signal lines, and a connecting member connecting the signal lines and the lead wires is held by a holding member formed of ceramic (see patent document 3).
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 4853782 (FIG. 1, FIG. 2)
Patent document 2: japanese laid-open patent publication No. 2002-221451
Patent document 3: japanese patent laid-open publication No. 2014-142327
Disclosure of Invention
Problems to be solved by the invention
However, although in the temperature sensor of patent document 1, the core wires and the lead wires are respectively connected within the metal tube by a pair of connection terminals, the connection terminals are exposed and not insulated from each other. Therefore, if a short circuit occurs between the connection terminals and further between the lead wires, the temperature measurement may no longer be performed or the temperature measurement accuracy may be degraded.
In addition, as a method of insulating the connection terminals, a tube using a heat-resistant resin such as teflon (registered trademark) is conceivable, but when the temperature sensor is used at a high temperature, the resin is carbonized when the heat-resistant temperature of the resin is exceeded, and a short circuit occurs between the connection terminals.
Further, as in the sensors of patent documents 2 and 3, insulation can be achieved by using ceramic mold parts and holding members, but the ceramic mold parts and holding members are heavy because they are rigid bodies, and may be broken by an impact of a stone (japanese: stone) or the like to impair the insulation.
Accordingly, an object of the present invention is to provide a temperature sensor in which a connection portion between a lead wire and a wiring from a temperature sensing element or a temperature measuring contact can be reliably insulated even at high temperatures.
Means for solving the problems
In order to solve the above problem, a 1 st aspect of the present invention provides a temperature sensor including: a temperature sensing element; a sheath member disposed on a rear end side of the temperature sensing element and having a pair of sheath wires connected to the temperature sensing element and a sheath outer tube having the sheath wires in an insulating material; and a pair of leads disposed on a rear end side of the sheath member and connected directly or indirectly to the sheath wires exposed at positions closer to the rear end side than the sheath outer tube, respectively, wherein the temperature sensor further includes an insulating cover portion formed of a glass braid and individually covering a pair of connection portions between the sheath wires and the leads at positions closer to the rear end side than the sheath outer tube so as to insulate the pair of connection portions from each other.
In the temperature sensor, since the connection portion between the lead wire and the sheath wire as the wiring from the temperature sensing element is individually covered with the insulating cover portion formed of a glass woven fabric and having high heat resistance inside the temperature sensor, the connection portion can be reliably insulated even at high temperatures. As a result, it is possible to suppress occurrence of a short circuit between the leads, which makes it impossible to measure the temperature any more, or a decrease in the temperature measurement accuracy.
In addition, since the glass woven fabric has flexibility, the glass woven fabric is less likely to break and has high impact resistance against stones and the like, as compared with an insulating material made of ceramics or glass alone.
The insulating cover may be tubular or may be formed by winding a sheet-like insulator around the connecting portion. Further, if the pair of connection portions can be insulated from each other, the connection portions may be partially covered.
The invention according to claim 2 provides a temperature sensor including: a pair of thermocouple wires; a temperature measuring contact formed by joining the tips of the pair of thermocouple wires to each other; a sheath member having at least a sheath outer tube having the thermocouple wires in an insulating material and protruding from front and rear ends of the sheath outer tube itself; and a pair of compensation wires disposed on a rear end side of the sheath outer tube and connected directly or indirectly to the thermocouple wires exposed on the rear end side of the sheath outer tube, respectively,
the temperature sensor further includes an insulating cover portion formed of a glass braid and individually covering a pair of connection portions between the thermocouple wire and the compensation wire at a position closer to a rear end side than the sheath outer tube so as to insulate the pair of connection portions from each other.
In the temperature sensor, since the connection portions between the compensation lead wires and the thermocouple wires as the wirings from the temperature measuring contacts are individually covered with the insulating covering portions formed of the glass braid and having high heat resistance in the temperature sensor, the connection portions can be reliably insulated even at high temperatures.
In addition, since the glass woven fabric has flexibility, the glass woven fabric is less likely to break and has high impact resistance against stones and the like, as compared with an insulating material made of ceramics or glass alone.
The insulating cover may be tubular or may be formed by winding a sheet-like insulator around the connecting portion. Further, if the pair of connection portions can be insulated from each other, the connection portions may be partially covered.
In the temperature sensor according to the present invention, the insulative covering portion may be tubular.
In the temperature sensor, the insulating cover portion is tubular, and therefore, the temperature sensor has more excellent mechanical strength and can perform insulation more reliably.
In the temperature sensor of the present invention, the weight change of the insulating cover portion at 25 to 600 ℃ may be 0.5% or less.
With this temperature sensor, since the insulating cover portion 25 has high heat resistance, the connection portion can be further reliably insulated at high temperatures.
The temperature sensor according to the present invention may further include a protection tube extending in the axial direction and having a distal end closed, the protection tube accommodating at least the distal end of the sheath member and the temperature sensing element, or the distal end of the sheath member and the temperature measuring contact.
With the temperature sensor, the temperature sensing element or the temperature measuring contact can be reliably accommodated and protected.
In the temperature sensor according to claim 1 or 3 or 4 that is dependent on claim 1, the sheath wire and the lead wire may be electrically connected to each other via a connection terminal to form the connection portion, and the insulating cover may cover at least the connection terminal.
Since the connection terminals are thicker and heavier than the sheath wire and the lead wire, the connection terminals are likely to be displaced and come into contact with each other (short-circuited) when the temperature sensor vibrates in accordance with the traveling of the vehicle or the like. Therefore, by covering the connection terminal with the insulating cover portion, the connection portion can be insulated more reliably even in the case of vibration.
In the temperature sensor according to claim 2 or 3 or 4 that is dependent on claim 2, the thermocouple wire and the compensation wire may be electrically connected to each other via a connection terminal to form the connection portion, and the insulating cover portion may cover at least the connection terminal.
Since the connection terminals are thicker and heavier than the thermocouple wires and the compensation wires, the connection terminals are likely to be displaced from each other and come into contact with each other (short-circuited) when the temperature sensor vibrates in accordance with the traveling of the vehicle or the like. Therefore, by covering the connection terminal with the insulating cover portion, the connection portion can be insulated more reliably even in the case of vibration.
In the temperature sensor according to the present invention, the temperature sensor may further include a 2 nd protection pipe, and the 2 nd protection pipe may accommodate at least the insulating cover portion in a non-contact manner.
With this temperature sensor, the insulating cover portion can be protected from the outside while ensuring the insulation of the insulating cover portion.
In the temperature sensor according to the present invention, the insulating cover may be formed by forming a glass coating layer on a surface of the glass woven body.
With this temperature sensor, the insulating cover is coated with glass on the surface of the glass woven tube, and therefore the glass woven fabric is less likely to fray, and the manufacturing stability and the insulating stability during use are improved.
ADVANTAGEOUS EFFECTS OF INVENTION
The present invention can reliably insulate the connection between the lead wire and the wiring from the temperature sensing element and the temperature measuring contact even at high temperature in the temperature sensor.
Drawings
Fig. 1 is a cross-sectional structural view of a temperature sensor according to embodiment 1 of the present invention, taken along an axial direction.
Fig. 2 is an enlarged view of the front end portion of fig. 1.
Fig. 3 is an enlarged view of the rear end portion of fig. 1.
Fig. 4 is a schematic cross-sectional view showing another embodiment of the insulative covering portion.
Fig. 5 is a cross-sectional structural view of the temperature sensor according to embodiment 2 of the present invention, taken along the axial direction.
Fig. 6 is an enlarged view of the front end portion of fig. 5.
Fig. 7 is an enlarged view of the rear end portion of fig. 5.
Fig. 8 is a schematic cross-sectional view showing one form of the sheet-like insulative covering portion.
Fig. 9 is a schematic cross-sectional view showing another embodiment of the sheet-like insulative covering portion.
Fig. 10 is a schematic cross-sectional view showing still another embodiment of the sheet-like insulative covering portion.
Description of the reference numerals
1. 1B, a temperature sensor; 90. a temperature sensing element; 20. a sheath member; 21. a sheath-core wire; 22. an outer sheath tube; 23. a connection portion (connection terminal); 25. 25B, 125a, 125B, 126, 127a, 127B, an insulating cover; 27. a connecting portion; 30. protecting the tube; 70. 2 nd protection pipe (outer cylinder); 80. a lead wire; 82. a compensation wire; 95. a temperature measuring contact; 96. 97, thermocouple wires; o, axis.
Detailed Description
Hereinafter, embodiments of the present invention will be described.
Fig. 1 is a cross-sectional structural view obtained by cutting a temperature sensor 1 according to embodiment 1 of the present invention along an axis O direction, fig. 2 is an enlarged view of a front end portion of fig. 1, and fig. 3 shows an enlarged view of a rear end portion of fig. 1.
The temperature sensor 1 according to embodiment 1 measures the temperature by a temperature sensing element 90 described later, and is configured to accommodate the sheath member 20 from the rear end side of the protective tube 30 made of metal.
The temperature sensor 1 is inserted into and attached to an opening (not shown) in a side wall of an exhaust pipe of an internal combustion engine, and detects the temperature of exhaust gas of an automobile. The temperature sensor 1 is also exposed to the temperature of the exhaust gas as the temperature thereof rapidly changes from a low temperature region of about 0 ℃ to a high temperature region of about 1000 ℃.
The temperature sensor 1 includes: a Pt resistor element (temperature sensing element) 90; a sheath member 20 connected to the Pt resistor element 90; a tubular insulating cover portion 25 described later; a bottomed cylindrical protection tube 30 that accommodates the Pt resistor element 90 and the sheath member 20; a mounting portion 50 fitted to the outer periphery of the protective tube 30; a nut portion 60 fitted with a gap on the outer periphery of the mounting portion 50; a cylindrical metal outer cylinder 70 attached to the rear end side of the attachment portion 50; and an auxiliary ring 26 made of heat-resistant rubber attached to the rear end of the outer cylinder 70, the auxiliary ring 26 having a lead 80 led out to the outside.
In the temperature sensor 1 of the present invention, the protection pipe 30 extends in the axis O direction, and the bottom side of the protection pipe 30 is referred to as a "front end" and the open end side of the protection pipe 30 is referred to as a "rear end".
The outer cylinder 70 corresponds to the "2 nd protection pipe" in the claim.
The Pt resistor element (temperature sensing element) 90 has: a Pt resistor section (temperature sensing section) 91 for measuring temperature; and a pair of element electrode lines 92 extending from one end (rear end side) of the Pt resistor section 91.
The Pt resistor 91 is a structure in which a film-like metal resistor is sandwiched by ceramic layers, and has a substantially plate-like shape as a whole, and the Pt resistor 91 is disposed in the protection tube 30 so that the longitudinal direction thereof is parallel to the axis O direction of the temperature sensor 1 (protection tube 30). The metal resistor is mainly composed of platinum (Pt) (50 mass% or more), and the pair of element electrode lines 92 are separately connected to the metal resistor.
Further, since the resistance value of the metal resistor changes in accordance with a change in temperature, the change can be detected as a change in voltage between the pair of element electrode lines 92. The ceramic layer may have a composition with an alumina purity of 99.9 mass% or more. Further, as the temperature sensing unit, a thermistor can be used in addition to the resistor of Pt or the like.
The sheath member 20 has a sheath core wire 21 connected to the pair of element electrode wires 92 of the Pt resistor element 90, and a metal sheath tube 22 accommodating the sheath core wire 21, and SiO is filled between the sheath core wire 21 and the inner surface of the sheath tube 222The insulating material is formed.
Since the element electrode wire 92 is usually an expensive Pt — Rh wire or the like, it is connected to an inexpensive sheath-core wire 21 made of SUS or the like, thereby achieving cost reduction.
The protective tube 30 is formed of SUS310S in the present embodiment, the distal end of the protective tube 30 is closed and extends straight in parallel to the axis O direction, the protective tube 30 further has a tapered portion 35 having an enlarged diameter toward the rear end side, and a portion of the protective tube 30 on the rear end side of the tapered portion 35 extends straight.
The inner diameter of the protection tube 30 on the tip side of the tapered portion 35 is smaller than the outer diameter of the sheath outer tube 22 of the sheath member 20 and larger than the maximum outer diameter of the Pt resistor portion 91. On the other hand, the inner diameter of the portion of the protective tube 30 on the rear end side of the tapered portion 35 is larger than the outer diameter of the sheath outer tube 22 of the sheath member 20.
Thus, when the sheath member 20 and the Pt resistor element 90 are inserted from the rear end side of the protective tube 30, the distal end side of the sheath member 20 abuts on the tapered portion 35 to position the insertion depth.
In addition, the distal end side of the sheath member 20 closes the opening of the protection tube 30, and at least the distal end side of the sheath member 20 and the Pt resistor element 90 are accommodated in the internal space of the protection tube 30. The internal space is filled with a binder 40.
The attachment portion 50 is formed in a substantially cylindrical shape in which a center hole through which the protection pipe 30 is inserted is open in the axis O direction, and a flange portion 51 having a large diameter, a cylindrical sheath portion 52 having a diameter smaller than that of the flange portion 51, a 1 st step portion 54 forming a front end side of the sheath portion 52, and a 2 nd step portion 55 forming a rear end side of the sheath portion 52 and having a diameter smaller than that of the 1 st step portion 54 are formed in this order from a front end side of the temperature sensor 1. The flange portion 51 has a tapered seat surface 53 at its distal end surface, and when a nut portion 60 described later is screwed into the exhaust pipe, the seat surface 53 is pressed against and sealed against a corner portion (not shown) of the side wall of the exhaust pipe.
The attachment portion 50 is press-fitted into the outer periphery of the rear end portion of the protective pipe 30, and the 2 nd step portion 55 and the protective pipe 30 are fixed by laser welding over the entire periphery thereof.
The outer cylinder 70 is press-fitted into the outer periphery of the 1 st stepped portion 54, and the both are fixed by full-periphery laser welding. The outer cylinder 70 accommodates and holds a connection portion (press terminal 23) between the lead wire 80 and the sheath core wire 21 led out from the sheath member 20.
The nut portion 60 has a center hole slightly larger in diameter than the outer periphery of the outer cylinder 70 in the axis O direction, and the nut portion 60 is formed with a threaded portion 62 and a hexagonal nut portion 61 larger in diameter than the threaded portion 62 from the tip end side. The nut portion 60 is fitted with a gap on the outer periphery of the mounting portion 50 (outer cylinder 70) and is rotatable in the axis O direction in a state where the front surface of the screw portion 62 is in contact with the rear surface of the flange portion 51 of the mounting portion 50.
The temperature sensor 1 is attached to the side wall of the exhaust pipe by screwing the screw portion 62 into a predetermined screw hole of the exhaust pipe.
Two sheath wires 21 are drawn out from the rear end of the sheath outer tube 22 of the sheath member 20, the terminal ends of the sheath wires 21 are connected to the front ends of the pair of press terminals 23 by welding, and the rear ends of the press terminals 23 are connected to the lead wires 80 by pressing.
The press terminal 23 corresponds to a "connection terminal" in the technical aspect.
In addition, each set of the sheath wires 21 and the crimp terminals 23 is insulated by the insulating cover 25.
Each lead wire 80 is led out to the outside through a through hole of a heat-resistant rubber washer 26 fitted inside the rear end of the outer tube 70, and is connected to an Electronic Control Unit (ECU) of the vehicle via an external circuit (not shown).
Further, the gap between the inner surface of the protection tube 30 and the Pt resistor element 90 and the gap between the inner surface of the protection tube 30 and the sheath member 20 are filled with the above-described binder 40 such as alumina, and the binder 40 holds the Pt resistor element 90 and the sheath member 20 to suppress the vibration thereof. As the binder 40, a material having high thermal conductivity, high heat resistance, and high insulation may be used.
Next, a structure including the insulative covering part 25, which is a characteristic part of the present invention, will be described with reference to fig. 3.
The insulative coating portion 25 is formed of a glass braid (a layer of ガラス), and individually covers and insulates the press terminals 23, which are a pair of connection portions connecting the sheath core wire 21 and the lead wire 80, at a position closer to the rear end than the sheath outer tube 22. Here, in the example of fig. 3, a pair of insulating cover portions 25 are provided, and each of the insulating cover portions 25 insulates each of the press terminals 23 so as to surround each of the press terminals 23.
The glass woven fabric refers to a form in which glass fibers are woven, and as glass, a composition containing 1 or more oxides selected from the group consisting of Si, Ca, Al, and Mg, for example, is exemplified.
In this way, in the temperature sensor 1, the connection portions (the press terminals 23) between the lead wires 80 and the sheath core wires 21 as the wiring from the temperature sensing element 90 are individually covered with the insulating cover portions 25 formed of a glass woven fabric and having high heat resistance, and therefore, even at high temperatures, the connection portions can be reliably insulated. As a result, it is possible to suppress occurrence of short-circuiting between the leads 80 and failure in measurement of temperature or reduction in measurement accuracy.
In the example of fig. 3, the insulative covering portion 25 extends between the rear end 22e of the sheath outer tube 22 and the front end 26f of the washer 26 in the axis O direction. The tip of the lead 80 near the insulating cover 24 protrudes to the tip beyond the tip 26f of the gasket 26.
Thus, the insulative covering portion 25 completely covers the press terminals 23 in the axis O direction. Since the press terminals 23 are thicker and heavier than the sheath wire 21 and the lead wire 80, the press terminals 23 are likely to be displaced from each other and come into contact (short-circuited) when the temperature sensor 1 vibrates in accordance with traveling of a vehicle or the like, and therefore, it is preferable to completely cover the press terminals 23 in the axis O direction with the insulative covering portion 25. This enables the connection portion to be insulated more reliably even in the case of vibration.
On the other hand, as in the temperature sensor 1B of fig. 5 to 7, when the connection portion is formed directly without using another member such as a press terminal, the connection portion may not be completely covered in the axis O direction by the insulating covering portion 25, and details thereof will be described later.
When the weight of the insulative covered portion 25 under the condition of 25 to 600 ℃ is 0.5% or less, the heat resistance of the insulative covered portion 25 becomes high, and therefore, the connection portion can be further reliably insulated at high temperature.
In the example of fig. 3, the outer cylinder 70 accommodates the insulative covering portion 25 in a non-contact manner. This ensures insulation of the insulating cover portion 25 and protects the insulating cover portion 25 from the outside.
Further, the insulating cover portions may not be a pair, and as shown in fig. 4, opposing inner surfaces of 1 cylindrical insulating cover portion 25B may be joined at one point to form a joint portion 25J, and two cylindrical portions 25h1, 25h2 may be formed across the joint portion 25J.
In this case, the pair of press terminals 23 are individually accommodated in the respective cylindrical portions 25h1, 25h 2.
Further, it is preferable that the insulating cover portion 25 is formed by forming a coating layer of glass on the surface of the glass woven body. Since the surface of the glass-woven tube is coated with glass in the insulating cover portion 25, the glass-woven fabric is less likely to fray, and the manufacturing stability and the insulating stability during use are improved. In addition, since the glass woven fabric has flexibility, the glass woven fabric is less likely to break and has high impact resistance against stones and the like, as compared with an insulating material made of ceramics or glass alone. In addition, the glass woven fabric has excellent insulation properties under a high temperature environment, compared to other inorganic woven fabrics.
The glass coating layer can be obtained by applying a raw material to the glass woven body by a known method and performing heat treatment.
Next, a temperature sensor 1B according to embodiment 2 of the present invention will be described with reference to fig. 5 and 6.
Fig. 5 shows a cross-sectional structural view obtained by cutting the temperature sensor 1B according to embodiment 2 of the present invention along the axis O direction, fig. 6 shows an enlarged view of the front end portion of fig. 5, and fig. 7 shows an enlarged view of the rear end portion of fig. 5.
The temperature sensor 1B according to embodiment 2 measures temperature by a temperature measuring contact 95 of a thermocouple described later, and is configured to accommodate the sheath member 20 from the rear end side of the metallic protection tube 30.
In the temperature sensor 1B, the same components as those of the temperature sensor 1 according to embodiment 1 are denoted by the same reference numerals, and description thereof is omitted. The temperature sensor 1B is also inserted into and attached to an opening (not shown) in a side wall of an exhaust pipe of an internal combustion engine, and detects the temperature of exhaust gas of an automobile.
The temperature sensor 1B includes: a pair of thermocouple wires 96, 97; a temperature measuring contact 95; an outer sheath tube 22; a cylindrical protective tube 30 with a bottom; an adhesion maintaining agent 40 disposed inside the protection pipe 30; a mounting portion 50 fitted to the outer periphery of the protective tube 30; a nut portion 60 fitted with a gap on the outer periphery of the mounting portion 50; a cylindrical metal outer cylinder 70 attached to the rear end side of the attachment portion 50; and a washer 26 made of heat-resistant rubber attached to the rear end of the outer cylinder 70, the washer 26 drawing the compensation wire 82 to the outside.
The thermocouple wires 96, 97 are formed of different metals from each other. In the present embodiment, one thermocouple wire 96 is formed of an alloy containing nickel, chromium, and silicon, and the other thermocouple wire 97 is formed of an alloy containing nickel and silicon.
The tips of the thermocouple wires 96 and 97 are joined to each other by welding or the like to form a temperature measuring contact 95.
The thermocouple wires 96 and 97 are inserted into the sheath outer tube 22, and cover the thermocouple wires 96 and 97 except for both ends. In the sheath outer tube 22 and the thermocouple wire96 and between the sheath outer tube 22 and the thermocouple wire 97, for example, are filled with SiO2The insulating material is formed.
Thus, the sheath tube 22 holds the thermocouple wires 96 and 97 in its interior in a state of being electrically insulated from the thermocouple wires 96 and 97.
In addition, in the temperature sensor 1B, the sheath wire 21 is not used, but the sheath outer tube 22 is the same member as the sheath member 20.
The thermocouple wires 96 and 97 are led out from the rear end of the sheath outer tube 22, and the terminal ends of the thermocouple wires 96 and 97 are directly connected to the corresponding compensation lead wires 82 by welding. Each of the compensation wires 82 is led out to the outside through a through hole of the washer 26 fitted to the inside of the rear end of the outer cylinder 70, and is connected to the ECU via an external circuit not shown.
Here, the connection portion 27 is formed by the welding portion where each thermocouple wire 96, 97 and the compensation lead wire 82 are electrically connected.
The thermocouple wires 96 and 97 are insulated by the insulating cover portion 25.
In the temperature sensor 1B according to embodiment 2 of the present invention, since the connection portions 27 between the compensation lead 82 and the thermocouple wires 96 and 97 as the wirings from the temperature measuring contact 95 are individually covered with the insulating covering portion 25 formed of a glass braid and having high heat resistance in the temperature sensor 1B, the connection portions can be reliably insulated even at high temperatures.
Here, as shown in fig. 7, it is preferable that the insulative covering portion 25 covers at least regions R extending from the rear ends E of the thermocouple wires 96, 97 in the axis O direction of the portions of the thermocouple wires 96, 97 exposed at the rear ends of the sheath outer tube 22 to the front and rear by a length of 50% LT, respectively, with respect to the length LT in the axis O direction.
In the case where the thermocouple wires 96 and 97 are directly connected to the compensation lead wire 82 without using a terminal of another member such as a crimp terminal, the thermocouple wires 96 and 97 and the compensation lead wire 82 are lighter than the terminal, and therefore, even if the temperature sensor 1 vibrates, the thermocouple wires 96 and 97 and the compensation lead wire 82 are less likely to be displaced from each other, and therefore, the exposed thermocouple wires 96 and 97 and the compensation lead wire 82 may not be completely covered in the axis O direction by the insulating covering portion 25.
However, since the region R is located between the fixed ends of the thermocouple wires 96 and 97 and the fixed end of the compensation lead 82 (the front end side of the exposed portion of the thermocouple wires 96 and 97 and the rear end side of the exposed portion of the compensation lead 82 in fig. 7) across the connection portion 27, the region R is likely to be displaced by vibration. Therefore, by covering at least the region R with the insulating cover portion 25, the connection portion can be insulated more reliably even in the case of vibration.
Of course, the exposed thermocouple wires 96 and 97 and the compensation lead wire 82 may be completely covered with the insulating cover portion 25 in the axis O direction.
When the positions of the rear ends of the thermocouple wires 96 and 97 in the axis O direction are different, the rear end E is the front end side of the rear ends of the thermocouple wires 96 and 97. This is because, in the present embodiment, the compensation lead 82 is firmly fixed by the washer 26, and the compensation lead 82 is thicker than the thermocouple wires 96, 97, so that the rear end side is less likely to be displaced by vibration, and the front end side is relatively likely to be displaced.
The present invention is not limited to the above embodiments, and naturally relates to various modifications and equivalents included in the spirit and scope of the present invention. For example, a thermistor sintered body may be used as the temperature sensing section instead of the Pt resistor section 91. As the thermistor sintered body, (Sr, Y) (Al, Mn, Fe) O can be used3A perovskite oxide having a basic composition, but is not limited thereto.
The connection portion between the sheath core wire and the lead wire is not limited to a form using an independent member such as the connection terminal, and may be a form in which the sheath core wire and the lead wire are directly overlapped and welded.
On the other hand, the connection portion between the thermocouple wire and the compensation lead may be formed using a separate member such as the connection terminal.
The insulative covering portion is not limited to a tubular shape, and may be a sheet shape.
For example, as shown in fig. 8, two sheet-like insulating covers 125a and 125b may be wound around each connection portion (pressing terminal 23) of the temperature sensor 1 shown in fig. 1.
As shown in fig. 9, the insulating cover portions 126 may be formed by winding 1 sheet around each connection portion (press terminal). In the example of fig. 9, the insulating cover portion 126 is wound in a shape of a letter 8 such that one end 126s side of the insulating cover portion 126 is wound around the connection portion 23a on one side (left side in fig. 9) in the clockwise direction, and then the insulating cover portion 126 is wound around the connection portion 23b on the other side (right side in fig. 9) so as to straddle the two connection portions 23a and 23b, and the insulating cover portion 126 is wound around the connection portion 23b in the counterclockwise direction such that the other end 126e of the insulating cover portion 126 is positioned on the connection portion 23b side.
As shown in fig. 10, the present invention may be configured to have an insulating cover 127b serving as a separator in addition to the 1 tubular (or sheet) insulating cover 127 a. In the example of fig. 10, the periphery of each connection portion 23 is covered with an insulating covering portion 127a, and an insulating covering portion 127b is disposed between the two connection portions 23a and 23b to insulate the two connection portions 23a and 23b from each other.
In order to prevent the insulating cover portion 127b from being accidentally moved in the insulating cover portion 127a, it is preferable that the length of the insulating cover portion 127b in the cross-sectional direction (the direction intersecting the axis O) is made larger than the inner diameter of the insulating cover portion 127a in the extending direction of the insulating cover portion 127b, and as shown in fig. 10, both ends of the insulating cover portion 127b are bent and both ends of the insulating cover portion 127b are locked to the inner surface of the insulating cover portion 127 a.
In the above embodiment, the protection tube 30 covers the sheath outer tube 22 up to the outer tube 70, but as in the sensors described in japanese patent laid-open nos. 2018-036188 and 2016-197095, the protection tube 30 may be configured to cover only the vicinity of the temperature measuring contact 95, the protection tube 30 may be configured to cover only the distal end portion of an intermediate outer tube independent of the outer tube 70, and the intermediate outer tube may be configured to cover the thermocouple wires 96 and 97 extending on the rear end side of the temperature measuring contact 95 and reach the outer tube 70.
Claims (9)
1. A temperature sensor is provided with:
a temperature sensing element;
a sheath member disposed on a rear end side of the temperature sensing element and having a pair of sheath wires connected to the temperature sensing element and a sheath outer tube having the sheath wires in an insulating material; and
a pair of leads disposed on a rear end side of the sheath member and connected directly or indirectly to the sheath wires exposed at a position closer to the rear end side than the sheath outer tube,
the temperature sensor is characterized in that it is,
the temperature sensor further includes an insulating cover portion formed of a glass braid and individually covering a pair of connection portions between the sheath core wire and the lead wire at a position closer to a rear end side than the sheath outer tube so as to insulate the pair of connection portions from each other.
2. A temperature sensor is provided with:
a pair of thermocouple wires;
a temperature measuring contact formed by joining the tips of the pair of thermocouple wires to each other;
a sheath member having at least a sheath outer tube having the thermocouple wires in an insulating material and protruding from front and rear ends of the sheath outer tube itself; and
a pair of compensation wires disposed on a rear end side of the sheath outer tube and connected directly or indirectly to the thermocouple wires exposed on the rear end side of the sheath outer tube,
the temperature sensor is characterized in that it is,
the temperature sensor further includes an insulating cover portion formed of a glass braid and individually covering a pair of connection portions between the thermocouple wire and the compensation wire at a position closer to a rear end side than the sheath outer tube so as to insulate the pair of connection portions from each other.
3. The temperature sensor according to claim 1 or 2,
the insulative covering part is tubular.
4. The temperature sensor according to any one of claims 1 to 3,
the weight change of the insulating covering part under the condition of 25-600 ℃ is less than 0.5%.
5. The temperature sensor according to any one of claims 1 to 4,
the temperature sensor further includes a protection tube extending in the axial direction and having a distal end closed, the protection tube accommodating at least the distal end of the sheath member and the temperature sensing element or the distal end of the sheath member and the temperature measuring contact.
6. The temperature sensor according to claim 1 or any one of claims 3 to 5 as dependent on claim 1,
the sheath core wire and the lead wire are electrically connected to each other via a connection terminal to form the connection portion,
the insulative covering part covers at least the connection terminal.
7. The temperature sensor according to claim 2 or any one of claims 3 to 5 when dependent on claim 2,
the thermocouple wire and the compensation wire are electrically connected to each other via a connection terminal to constitute the connection portion,
the insulative covering part covers at least the connection terminal.
8. The temperature sensor according to any one of claims 1 to 7,
the temperature sensor further includes a 2 nd protection pipe, and the 2 nd protection pipe accommodates at least the insulating cover portion in a non-contact manner.
9. The temperature sensor according to any one of claims 1 to 8,
the insulating cover is formed by forming a glass coating on the surface of the glass woven body.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-151551 | 2018-08-10 | ||
| JP2018151551 | 2018-08-10 | ||
| JP2019-078775 | 2019-04-17 | ||
| JP2019078775A JP6608088B1 (en) | 2018-08-10 | 2019-04-17 | Temperature sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110823390A true CN110823390A (en) | 2020-02-21 |
Family
ID=68613374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910734756.1A Pending CN110823390A (en) | 2018-08-10 | 2019-08-09 | Temperature sensor |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20200049571A1 (en) |
| JP (1) | JP6608088B1 (en) |
| CN (1) | CN110823390A (en) |
| DE (1) | DE102019121352A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102449907B1 (en) * | 2020-09-11 | 2022-09-30 | 주식회사 에스엠에스 | A manufacturing method of temperature sensor using measure of exhaust gas |
| CN113418634A (en) * | 2021-06-18 | 2021-09-21 | 宝武集团鄂城钢铁有限公司 | Repairing method of blast furnace temperature measuring couple |
| CN113959576A (en) * | 2021-11-08 | 2022-01-21 | 首凯汽车零部件（江苏）有限公司 | Sensor for measuring temperature in oil pipe |
| WO2023101931A1 (en) * | 2021-12-02 | 2023-06-08 | Therm-O-Disc, Incorporated | Sensor with integral seal |
| KR102522900B1 (en) * | 2022-10-20 | 2023-04-18 | 주식회사 볼트온 | Maufacturing method of thermocouple that can minimize the generation of harmful substances |
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Also Published As
| Publication number | Publication date |
|---|---|
| DE102019121352A1 (en) | 2020-02-13 |
| JP6608088B1 (en) | 2019-11-20 |
| US20200049571A1 (en) | 2020-02-13 |
| JP2020027102A (en) | 2020-02-20 |
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